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001033591 1001_ $$0P:(DE-HGF)0$$aSchneider, Matthias$$b0$$eCorresponding author
001033591 245__ $$aAssessing the potential of free-tropospheric water vapour isotopologue satellite observations for improving the analyses of convective events
001033591 260__ $$aKatlenburg-Lindau$$bCopernicus$$c2024
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001033591 520__ $$aSatellite-based observations of free-tropospheric water vapour isotopologue ratios (HDO  H2O, expressed in form of the δ value δD) with good global and temporal coverage have become available recently. We investigate the potential of these observations for constraining the uncertainties of the atmospheric analyses fields of specific humidity (q), temperature (T), and δD and of variables that capture important properties of the atmospheric water cycle, namely the vertical velocity (ω), the latent heating rate (Q2), and the precipitation rate (Prcp). Our focus is on the impact of the δD observations relative to the impact achieved by the observation of q and T, which are much more easily observed by satellites and are routinely in use for atmospheric analyses. For our investigations we use an Observing System Simulation Experiment; i.e. we simulate the satellite observations of q, T, and δD with known uncertainties and coverage (e.g. observations are not available for cloudy conditions, i.e. at locations where the atmosphere is vertically unstable). Then we use the simulated observations within a Kalman-filter-based assimilation framework in order to evaluate their potential for improving the quality of atmospheric analyses. The study is made for low latitudes (30° S to 30° N) and for 40 d between mid-July and the end of August 2016. We find that q observations generally have the largest impacts on the analyses' quality and that T observations have stronger impacts overall than δD observations. We show that there is no significant impact of δD observations for stable atmospheric conditions; however, for very unstable conditions, the impact of δD observations is significant and even slightly stronger than the respective impact of T observations. Very unstable conditions are rare but are related to extreme events (e.g. storms, flooding); i.e. the δD observations significantly impact the analyses' quality of the events that have the largest societal consequences. The fact that no satellite observations are available at the location and time of the unstable conditions indicates a remote impact of δD observations that are available elsewhere. Concerning real-world applications, we conclude that the situation of δD satellite observations is very promising but that further improving the model's linkage between convective processes and the larger-scale δD fields might be needed for optimizing the assimilation impact of real-world δD observations.
001033591 536__ $$0G:(DE-HGF)POF4-5111$$a5111 - Domain-Specific Simulation & Data Life Cycle Labs (SDLs) and Research Groups (POF4-511)$$cPOF4-511$$fPOF IV$$x0
001033591 536__ $$0G:(GEPRIS)416767181$$aDFG project G:(GEPRIS)416767181 - TEsten von Isotopologen als Diabatischer Heizratenindikator für atmosphärische DatenanalYsen (416767181)$$c416767181$$x1
001033591 588__ $$aDataset connected to CrossRef, Journals: juser.fz-juelich.de
001033591 7001_ $$0P:(DE-HGF)0$$aToride, Kinya$$b1
001033591 7001_ $$0P:(DE-Juel1)196659$$aKhosrawi, Farahnaz$$b2
001033591 7001_ $$0P:(DE-HGF)0$$aHase, Frank$$b3
001033591 7001_ $$0P:(DE-HGF)0$$aErtl, Benjamin$$b4
001033591 7001_ $$0P:(DE-HGF)0$$aDiekmann, Christopher J.$$b5
001033591 7001_ $$0P:(DE-HGF)0$$aYoshimura, Kei$$b6
001033591 773__ $$0PERI:(DE-600)2505596-3$$a10.5194/amt-17-5243-2024$$gVol. 17, no. 17, p. 5243 - 5259$$n17$$p5243 - 5259$$tAtmospheric measurement techniques$$v17$$x1867-1381$$y2024
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